When ever you start your computer it gets switch off ,,there are many reason

1.check that *********** boat fan is working properly ,check the fan should not be blocked with rubber bands ,if the rubber band blocks it and the fan is not able to rotate then the computers switches off which even happened to me

2.maybe a problem is the power supply in the mother boat

3.check windows is insalled properly if now install a new windows from doss

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Slow PC does not mean it has problem only with motherboard. Speed of the PC also depend on the following factors :

Processor

RAM

Virtual memory

Operatin system

Video graphics card

To fix the problem you should first check which type of processor is used in you PC. Is it pentium4, Dual core, Core 2 duo or core 2 quad ? Core 2 quad is much faster if used with 4 GB RAM.
RAM is also the cause to slow the PC. If you are using less RAM automatically your PC will be slow. So use RAM higher i.e 2 GB or more.
Virtual memory does not have much impact on speed but it is also a factor to slow down the PC. But if you can correct any of the three parts then no need to check virtual memory.
If you are using operating system like Vista then computer may be slow. Instead use XP professional, Windows 7.
If your PC doesn't have graphics card then it will be slow while playing games, watching videos. So if you are a game lover then change your graphics card with higher value such as 2 GB or more.
If you will fix these problems then you can speed up your PC

it defend to your processor is for socket 478 motherboard and you going to upgrade *********** to intel 865 it supposed to be socket 478 too also if not your processor is useless because socket 478 mother is already phase out the new mother now using socket lg775 for intel dual core and quadro core processor

The largest pentium 4 processor on the market is the 3.4 ghz pentium 4 processor it comes in extreme edition but thats rather pricey. Your motherboard should be able to support it. Your computer will probably support up to 4 gigs of ram.

It's ok to upgrade the processor to P4 the mother board is capable to run the pentium 4 2.0Ghz only . I said that because i'm using that type of motherboard ecs p4vmm2 with processor 2.0Ghz. But for my opinion the problem of your friend computer is not the processor is about the cooling fan heatsink because if the heatsink is not fit or properly lock the processor is over heating that's why the computer hanging and shutdown. If you can tight the two clip that was broken the problem is solved because i have also the same problem before one of my client computer. but if you friend want to upgrade to p4 it's better to buy also a new fan and heatsink for P4.

Hi, according to the Dell website you have a LGA775 socket on your motherboard. Therefore, you can only buy processors that fit into this socket. Here is a list of some offered by Intel that will work:
Celeron D 325 2.53 GHz
Celeron D 330 2.66 GHz
Celeron D 335 2.8 GHz
Celeron D 340 2.93 GHz
Pentium4 520 2.8 GHz
Pentium4 530 3.0 GHz
Pentium4 540 3.2GHz
Pentium4 550 3.4 GHz
Pentium4 560 3.6 GHz
Pentium4 570 3.8 GHz
The processors that won't work are the ones that are not compatible with this socket. Everytime you look up a cpu it will tell you which socket it is designed for.
To buy a cpu you will need to decide:
The brand you want.
The speed of the cpu that you want.
Extras i.e. Hyperthreading, etc.
How much you are willing to pay for it.
Then you can narrow your search as you stick within your limits.
Let me know if you have more questions.
Good Luck